PM121 has the following specifications:

50 - Size 1/2"

Engineered for Superior Marine Sound Injection-molded woofer cone bodies and marine-grade suspension components

Features a universal fit for any USB Type-A connector

Internal Cooling Unit

Vetus P102826 - HRC-FF 8mm 5/16" 24V 6EKOD PM121 has the following specifications:The sleek, compact HRCFF 6 7 8 are Maxwells horizontal versions of the latest innovative vertical RC6 and RC8 automatic rope chain windlasses. The HRCFF Series are packed with original and proven features including patented rode management technology developed by Maxwell. Features and benefitsActivate the up control and the free fall device automatically disengages allowing you to power up your anchorAesthetically pleasing above deck design,